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Journal of Ceramic Science and Technology 1/2019

Vol. 10, No. 1 · March 2019

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Graphite carbon enclosed AlN nanoparticles with enhanced methanol-tolerant electrocatalytic properties for oxygen reduction

C. Liang, H. Wang, K. Huang, W. Liu, K. Bi, M. Lei

Pages 1-8 · DOI: 10.4416/JCST2018-00041

The methanol crossover effects and high-cost of Pt based catalysts severely restrict the practical applications of direct methanol fuel cells (DMFCs). In this work, a novel structure of ∼25 nm AlN nanoparticles with graphite carbon outer coating (AlN@C) was synthesized via a one-step solid-state method with simultaneous nitridation processes and carbon graphitization. AlN@C nanocomposites were exploited as a catalyst of the oxygen reduction reaction (ORR). Benefited from the graphite carbon outer coating, AlN@C exhibits enhanced electrochemical properties (more positive onset potential and hig …

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Low temperature synthesis of alpha alumina platelets and acicular mullite in MgO-Al₂O₃-SiO₂ system

M. A. Zalapa-Garibay, M. A. Zalapa-Garibay, A. Arizmendi-Moraquecho, S. Y. Reyes-López

Pages 9-18 · DOI: 10.4416/JCST2018-00043

The refractory materials are more reliable and less expensive, this research is based on materials like alumina and mullite because it offers a very high refractoriness. In the present study an acicular mullite and α-alumina platelets were synthesized by using a synthesis of chemicals related to raw materials SiO2 45 wt%-Al2O3 45 wt% – MgO 10 wt%. The α-alumina platelets and acicular mullite were obtained in a reduced processing time and temperature, compare to conventional methods, such as sol-gel method, microwave sintering, chemical synthesis, combustion synthesis and lip casting and sinter …

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Integration of Piezoceramic Composites into Structural Components: Effect on the Polarisation State and Polarisability

K. Hohlfeld, S. Eßlinger, A. Eydam, A. Winkler, T. Weber, M. Gude, N. Modler, G. Gerlach, G. Suchaneck, A. Michaelis, A. Michaelis, A. Schönecker, S. Gebhardt, P. Neumeister

Pages 19-26 · DOI: 10.4416/JCST2018-00071

In lightweight construction, structural components with integrated piezoelectric sensors and actuators find application for condition monitoring, structural health monitoring, vibrational control, and reduction of noise emission. In order to create such multifunctional, so-called smart components, an integration technique for serial production, designed for embedding of piezofibre composites into thermoplastic structures, was developed recently. During the two-stage fabrication process, thermal and mechanical loads act on the piezoceramic, which can lead to partial depolarisation and thus degr …

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Sol-Gel Synthesis of Strontium Titanate Nanofibers by Electrospinning

J. H. Roque-Ruiz, J. Meraz-Angel, R. Farias, M. Meléndez-Lira, S. Y. Reyes-López

Pages 29-38 · DOI: 10.4416/JCST2018-00072

The preparation of homogeneous SrTiO3 nanofibers has been difficult and there are few publications in this field. In this research, consistent structures of strontium titanate ceramic fibers were obtained using an easy sol-gel and electrospinning methodology, giving an alternative for preparing ceramics in the form of fibrillar membranes. Two sol-gel solutions starting from Strontium nitrate and titanium tetraisopropoxyde were prepared and then mixed and homogenized with polyvinylpyrrolidone polymeric solution. The green fibers obtained from the ceramic precursors had a diameter of 140 to 180 …

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Preparation of ultra-stable foams stabilized by large-size platelet particles via direct foaming method

W. Huo, X. Zhang, B. Ren, J. Liu, D. Wang, J. Yang

Pages 39-44 · DOI: 10.4416/JCST2018-00073

Stable colloidal foams that are usually stabilized by 0.02 – 5 μm particles have attracted increasing interests due to their outstanding stability. However, there were no studies on stable foams stabilized by large platelet particles so far. In this paper, we reported the study and successful preparation of ultra-stable foams using platelet particles with large particle size of dozens of microns for the first time, which subverts the conventional wisdom about particle-stabilized foams. Herein, intact platelet diatomite particles with diameter in the range of 10 – 50 μm was employed as starting …

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